(57) ® A radio transceiver includes an antenna (17), a transmitter (3), a receiver (4),
an antenna switching circuit (2a) for selectively connecting the transmitter (3) and
the receiver (4) to the antenna (17), a filter (1) connected to the antenna (17) and
a series connected first diode (22) and an inductor (23) connected between the end
of the fitter (1) and a point of fixed potential, the junction between the first diode
(22) and the inductor (23) being connected to an input of the receiver (4), and a
second diode (21) being connected between the other end of the filter (1) and an output
of the transmitter (3).
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